Little metal-looking beads

[drjreber]

Hello, everyone. Can someone ID this? Perfectly round little balls -look fairly solid. Shiny nearly black arranged in a rosette. No others present anywhere in the tank, and they have not changed in size, shape or color in almost 2 weeks.

 

[ISpeakForTheSeas]

Bubble algae - generally considered a pest as it can spread pretty invasively.

 

[drjreber]

I did think about that but it was arranged so regularly and hasn’t gotten any larger. If that’s what it is, then I am definitely sucking it out! Thanks for the ID!